Valved Exhaust System for Audi RS4 Avant / RS5 Coupé / Cabriolet B8.5 4.2 V8 (2012-2015)
Configuration
Audi RS4 Avant / RS5 Coupé / Cabriolet B8.5 4.2 V8 Valved Exhaust System (2012-2015)
Valves
Operated by remote control, factory-paired.
Estimated at 0.50 m from the outlet, 45°, 2,000 rpm with a warm engine. Allow ± 2 dB depending on the engine and measuring point. A 3 dB difference is audible in a direct comparison; 10 dB sounds roughly twice as loud.
Configuration guide
Sound intensity with the valves open, on a scale of 0 to 10.
| Configuration | Intensity |
|---|---|
| Decat manifolds + Rog cat-back | 10/10 |
| 100-cell sports catalytic converter + Rog cat-back | 9/10 |
| 200-cell sports catalytic converter + Rog cat-back | 8/10 |
| Rog cat-back only, factory catalytic converter retained | 7/10 |
| Factory exhaust, for comparison | 3/10 |
AudiA4 / A5 / S4 / S5 / RS4 / RS5 B8 / 8T
The Audi RS4 and RS5 B8.5 exhaust in detail.
The 4.2 FSI in the RS4 Avant and RS5 Coupé B8.5 belongs to an endangered species: the high-revving naturally aspirated V8, which goes beyond 8,000 rpm with a response modern turbos cannot reproduce. It produces 450 hp and 430 Nm. This page covers 2012 to 2015; the twin-turbo V6 RS4 and RS5 B9, like the RS5 8T, have their own page.
Its voice builds with the revs, hoarse in the mid-range and then howling beyond 7,000 rpm. The heavy, filtered factory exhaust holds back precisely the middle part. With the valves open, our valved cat-back reduces back pressure and makes the crescendo continuous, from idle to the red line. With the valves closed, the RS stays usable every day without fatigue.
Here, the “Manifold” option lives up to its name: on this naturally aspirated V8, it is the manifolds, with their catalytic converters, that collect the gases at the cylinder outlets. Anyone keeping their RS4 for the road will take these manifolds with 200 cells, the only ones that keep the eight-cylinder’s emissions control; the 100-cell ones are accepted or not depending on the car and the rules in your country, while the decat version is reserved for track use. The gain is real but modest, around 3 to 8% with an ECU remap.
The assembly ends in oval tailpipes and fits with clamps and gaskets, no welding, in about two hours on a lift. The valves follow the drive modes if your Audi has them from the factory, otherwise the Rog remote. In titanium, the system weighs around 40% less than in 304 stainless steel and takes on a more metallic tone; brushed, gold or purple finishes.
Audi RS4 Avant / RS5 Coupé / Cabriolet B8.5 4.2 V8 exhaust specifications.
| System type | Valved cat-back (valve exhaust), oval tailpipes, built to your VIN |
|---|---|
| Vehicles and chassis code | Audi RS4 Avant, RS5 Coupé and RS5 Cabriolet B8.5 |
| Engine | 4.2 FSI, naturally aspirated V8, 450 hp and 430 Nm |
| Years | 2012-2015 |
| Materials and finishes | 304 stainless steel or titanium; titanium in brushed, gold or purple |
| Valves | Factory control through the drive modes, or the Rog remote |
| Front section (option) | Manifolds with 200-cell or 100-cell catalytic converters, or decat |
| Fitting | Clamps and gaskets, no welding, about 2 hours |
| Manufacturing and delivery | Made to order, 20 working days from confirmation to delivery, free delivery |
| Warranty | 3 years, parts and workmanship |
Questions about the Audi RS4 Avant / RS5 Coupé / Cabriolet B8.5 4.2 V8 exhaust.
And what if my RS5 B8.5 is a convertible?
It is covered: the RS5 Cabriolet, sold from 2013 to 2015, takes the same Rog system as the RS5 Coupé, with the same 4.2 V8 and the same clamp-and-gasket fitting. For a 2011 car, outside the years covered by this page, send the VIN before ordering: we check before manufacturing.
Are the RS4 B8.5 manifolds worth the expense?
On this naturally aspirated V8, the gain exists but remains modest, 3 to 8% with an ECU remap. The published Stage 2 figures are 499 hp and 473 Nm. If you are after the sound first, the cat-back alone already transforms the car.
Which RS5 B8.5 should be presented at vehicle inspection after fitting?
The V8, shut in behind its valves, returns to a level close to factory, and emissions control remains with the cat-back only or the 200-cell manifolds. In 100-cell form, the manifolds pass or not depending on the vehicle and your country’s rules; decat, they confine the RS5 to the track.
Does the RS4 Avant B8.5 keep its original engine management with the cat-back?
Yes: the cat-back requires no ECU remap and the V8 keeps its 450 hp. A remap only makes sense to turn the manifolds into power.
Audi RS4 Avant / RS5 Coupé / Cabriolet B8.5 4.2 V8: Does a valved exhaust system drone?
No. With the valves closed, the gases flow through the whole rear silencer and the cabin stays calm at a steady speed. Our Rog exhausts are designed to avoid drone. Learn more: Why our systems stay calm on the motorway.
Audi RS4 Avant / RS5 Coupé / Cabriolet B8.5 4.2 V8: straight pipe or resonator?
On this model, two characters at the same price: the straight pipe for the raw sound of your engine, unfiltered, or the resonator for a rounder and slightly softer voice. Either way, the exhaust stays fully sporty. Learn more: Exhaust resonator: what does it do? Straight pipe or resonator, which sound to choose.
Rog expert guide
Audi RS4 B8: bringing out the naturally aspirated V8, the complete exhaust system guide
The RS4 B8 is one of the last naturally aspirated V8 family cars in history: 450 hp at 8,250 rpm in an estate. Its market value has clearly caught on. On this engine, the exhaust decides everything: the car is...
In detail
Rog Advisor
A question about this exhaust?
Fitment, sound, catalyst, valves, delivery: the answer comes straight away, with your configuration in context.
The Rog Advisor is an automated assistant trained on our product pages and answers. For an important decision, write to us: we confirm by e-mail.
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Reviews imported from our previous system and translated from French; verified purchases carry the badge.
Rog presentation film: choosing your vehicle, Standard or Equal Length design, stainless steel or titanium, Z-Pipe, controlled valves, titanium and tip finishes, and support from choosing your configuration through to shipping.
THE Rog CRAFT
Our process.
From the first bend to the last check. The same care at every step.
-
Design
Designed for your vehicle.
Geometry matched to your model, carefully studied bends and precise mounting points. Everything starts with accurate design.
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Manufacture
Crafted with precision.
Tube bending, part fitting and TIG welding: every joint receives the same care.
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Finishing
Material, elevated.
The finish reveals the character of the metal. Stainless steel or titanium, depending on the options available for your vehicle.
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Assembly
Every part in its place.
Components are assembled and adjusted. On valved systems, the mechanism is fitted, set up and tested.
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Inspection
Check. Then approve.
Geometry, welds, connections and gas flow: the key points are inspected before shipping.
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Shipping
Ready to join you.
Reinforced packaging protects your exhaust in transit. The final step before giving your vehicle a new voice.
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